He also claims he has suffered discrimination in the office because of his gender switch and is afraid he will lose his job.
Wong said his requests for a departmental transfer and early retirement have been ignored and his performance rating has been downgraded.
His complaint is now before the Equal Opportunity Commission and awaits an official response from the bank.
A HSBC spokesperson told the Standard the company was aware of the situation but stressed that the HSBC treats all employees with the same respect.